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/*
* Copyright (c) 2016 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @brief Glean Adjacency
*
* A gleean adjacency represent the need to discover new peers on an
* attached link. Packets that hit a glean adjacency will generate an
* ARP/ND packet addessesed to the packet's destination address.
* Note this is different to an incomplete neighbour adjacency, which
* does not send ARP/ND requests to the packet's destination address,
* but instead to the next-hop address of the adjacency itself.
*/
#ifndef __ADJ_GLEAN_H__
#define __ADJ_GLEAN_H__
#include <vnet/adj/adj_types.h>
/**
* @brief
* Add (and lock) a new or lock an existing glean adjacency
*
* @param proto
* The protocol for the neighbours that we wish to glean
*
* @param sw_if_index
* The interface on which to glean
*
* @param nh_addr
* the address applied to the interface on which to glean. This
* as the source address in packets when the ARP/ND packet is sent
*/
extern adj_index_t adj_glean_add_or_lock(fib_protocol_t proto,
vnet_link_t linkt,
u32 sw_if_index,
const fib_prefix_t *conn);
/**
* @brief Get an existing glean
*
* @return INVALID if it does not exist
*/
extern adj_index_t adj_glean_get(fib_protocol_t proto,
u32 sw_if_index,
const ip46_address_t *nh_addr);
/**
* adj_glean_update_rewrite
*
* Called by an adjacency provider (an interface type) to configure
* a glean adj (i.e. and adjacency linked to a connected prefix) to
* its default behaviour.
* Other interface types (i.e. 6RD tunnels) can can choose not to use
* glean behaviour on an adjacency liked to a connected prefix.
*/
extern void adj_glean_update_rewrite(adj_index_t adj_index);
/**
* Return the source address from the glean
*/
const ip46_address_t *adj_glean_get_src(fib_protocol_t proto,
u32 sw_if_index,
const ip46_address_t *nh_addr);
/**
* @brief Format/display a glean adjacency.
*/
extern u8* format_adj_glean(u8* s, va_list *ap);
/**
* Walk all the gleans on an interface
*/
extern void adj_glean_walk (u32 sw_if_index,
adj_walk_cb_t,
void *);
/**
* @brief
* Module initialisation
*/
extern void adj_glean_module_init(void);
/**
* @brief
* Return the size of the adjacency database. for testing purposes
*/
extern u32 adj_glean_db_size(void);
#endif
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